I carry some USB WiFi stick when I encounter this to see if that shuts down (it rarely does) and the stick is usually the fix since hardware repair can be as much as a new laptop.
The other thing to try is a factory reset of the laptop. This is not always possible as the owner didn't backup their stuff. At some point the owner wipes out and you can do the factory reset.
-> Your post doesn't reveal if there is anything non-stock in the laptop. That is, if you installed Big Red's Protection Suite and Optimizer then I won't know and won't call it out. Whatever is not stock from the maker is always suspect.
I am experiencing random wi-fi loss and an inability to reconnect without restarting my laptop. I know it isn't my network as it works well with other devices. It is as though it just falls asleep and unless i restart my computer it will not work again. I own an Asus X540XA with windows 10 (64bit) laptop and it uses a Qualcomm Atheros AR9485 network adapter. This is a random occurrence so nothing special happens to make the loss of connection occur however I do realize (as im typing this) that it is almost as though the adapter can't handle all the data so it shuts off... just a guess.